<html>
<body>
<h1>Calculator</h1>

<h2>Add</h2>
<form action="add">
    <label for="x">x:</label><input id="x" name="x" type="text" value="42"/>
    <label for="y">y:</label><input id="y" name="y" type="text" value="23"/>
    <input type="submit" />
</form>

<h2>Subtract</h2>
<form action="subtract">
    <label for="x">x:</label><input id="x" name="x" type="text" value="42"/>
    <label for="y">y:</label><input id="y" name="y" type="text" value="23"/>
    <input type="submit" />
</form>

<h3>Multiply</h3>
<a href="/multiply/42/23">/multiply/42/23</a>

</body>
</html>